#include <stdio.h>

int main(int argc, char const *argv[])
{
    int l = 1;
    int i = 0;
    int k = 1000;
    while (l)
    {
         if (i == k)
        {
            l = 0;
        }
        else
        {
            i = i;
        }
        printf("%d\n",i);
        i += 2;
    }
    
    return 0;
}
